emitter garbage

eg.js

const EventEmitter = require('events')

class UserEmitter extends EventEmitter {}

const e = new UserEmitter()
e.on('incomingData', (data) => {
  data.forEach((user) => e.emit(user.id, user))
})
userId = 0
class User {
  constructor(name) {
    this.id = ++userId
    this.name = name || 'default'
    this.listener = (newData) => Object.keys(newData).forEach((key) => this[key] = newData[key])
    e.on(String(this.id), this.listener)
  }

  destroy() {
    e.removeListener(String(this.id), this.listener)
  }
}

var u1 = new User('asdf')
var u2 = new User('zxcv')

console.log('u1 name:', u1.name)
console.log('u2 name:', u2.name)

e.emit('incomingData', [
  {
    id: 1,
    name: 'first'
  },
  {
    id: 2,
    name: 'second'
  },
  {
    id: 3,
    name: 'third'
  },
])

console.log('u1 name:', u1.name)
console.log('u2 name:', u2.name)

u1.destroy()

e.emit('incomingData', [
  {
    id: 1,
    name: 'dead'
  },
  {
    id: 2,
    name: 'changed'
  },
])

console.log('u2 name:', u2.name)